My 20 month old little boy is always thirsty and goes through a box of diapers (72) in about a week and a half. My sister-in-law watched him one day and thought that maybe he was drinking a lot because he was playing outside and it was very hot. My little boy drinks more liquids than anyone I have ever met. He is always thirsty and never seems to get enough. His out put however is also a concern. Even though he does drink a lot it seems he urinates so much more. We put a fresh diaper on him when he goes to bed at 9pm by 6am it is so full that he gets himself and the bed wet. Most of the time the diaper is so full that the filling is all over him and the bed. I am not sure what is going on and since I am a new mom I was wondering if anyone has any input.